Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1075310 A
Publication typeGrant
Publication dateOct 7, 1913
Filing dateApr 22, 1913
Priority dateApr 22, 1913
Publication numberUS 1075310 A, US 1075310A, US-A-1075310, US1075310 A, US1075310A
InventorsMelchior C Ulrich
Original AssigneeGeorge B Dunn, George W Korte, Melchior C Ulrich
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1075310 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

M. '0. ULRGH.



Manor-iron c. ULRICH, or SEATTLE, we nunnnnnrrrs To GEORG-n n. DUNN sintieron, issioivon or srir'rnnn'erin-"1y erin Trainen-Treinen oNn-rroriDnnnr-I TO GEORGE W. KGRTE, SEATTLE, ASHINGTGN.


Specification of Letters Patent.

Patented ct. 7, i913.

Application filed April 22, ll. Serial No. *62,8'6l.

all lwhom v1' t may Concerny Bc it known that l, Mniioirron C. ULnicH, a citizen ot the United States of America7 and a resident of the city ot Seattle, in the county of King and State of lashing-ton, have invented certain new and useful lmprovements in Nut-Locks, of which the Jtollowing is a specification.

y invention relates to nut locks and it has for its primary aim to provide a novel construction whereby the nut and bolt elements may be eteiently and securely locked from independent movement.

Other objects will appear as my description progresses, and those features ot construction, arrangement and combination of parts on which l desire protection, succinctly defined in my annex-ed claims.

Referring to the accompanying drawing` wherein like characters 0f reference indicate like parts throughout: Figure l is a view of a nut and bolt embodying my invention, the two elements beingin unlocked relation. Fig. 2 is a similar view in which the elements are locked, and Fig. 3 is an eularged fragmentary section illustrating the threads in locked relation.

In the drawing, the members l, l and l" are beingshown clamped or secured together by bolt. 2 and nut 3. rlllhe latter embody my invention, which is such that w ien the nut 3 is limited in its advancing movement by engaging' with member l, an eXtra wrench or turn of said nut will distort the interlocking threads sutliciently to prevent independent movement between the bolt and nut.

The thread 2 of: bolt` 2 has its face, adjacent the bolts head, out out or under cut, as at el, to provide a bendable or yieldable point 5. The thread 3 ot' nut 3 is provided with convex and concave faces 6 and 7, respectively, the latter being' arranged in advance of under-cut face fl of bolt thread 2 and engaged by the thread point 5, while the convex face 6 engages the iace 8 of said thread 2.

The nut is applied to the bolt in the usual manner and when the 'former has reach-ed its limit of movement, determined by member l, the nut is locked on said bolt by an extra wrench on turn, which will cause point 5 to ride down tace 7 toward the base of thr ad 3. Such riding of point 5 will bend or distort the thread point to lessen the bearing surface between faces 8 and G and present a bearing,r surface ou face -l 'for the concave tace 7, as shown in Fig. 3. The additionally provided friction between the bolt and nut will lock the two together for all practical purposes and necessitate a greatly increased amount of energy to remove the nut.

The bolt and nut may be used many times or until the tace 4 has practically assumed the curve of tace 7. ln utilizing` my invention tok unite. parts subject to vibration, the nut will grip the bolt more securely due to the under-cut. as the friction between the bolt and nut is accordingly increased with the bearing surface ot' tace 4L. the latter bci'ng enlarged tl'lrough the urther bending of pointl 5.

Having thus described my invention, what l claim as new, and desire to secure by Letters Patent oi the United States of America, is

l. ln a device of the character described a threaded bolt member, and a threaded nut member, the point only of the thread ot one of said members normally engaging the thread ot the other member and adapted to bent to bring a portion of its threaded face in Contact with the thread oi the last mentioned member.

2. ln a device ot the character described, a threaded bolt member, and a threaded nut member, the pointI only of the thread ot' one of said members normally engaging` the side tace oft the thread oi the other member.

3. in a device oi the character described, a t faded bolt, and a threaded nut therefor, the thread of one of the aforesaid' elements beine, provided with a concaved face arranged in advance and a convert face in rear of the thread of the other of said elements.

4l. in a device of .the character described.

a threaded bolt element, and a threaded mit Signed at Seattle, TWashington this 14th element therefor, the thread of one of the day of April 1913.

aforesaid elements loenov adapted to pre- Tn sent a greater bearing Surface for the n- MELCHIOR C" ULRLUH' terlockng thread of the other of Said elelVtnJSses:

ment-s when the lat-ter are restrained from E, ARLITA ADAMS- advaneng toward one another. CLARA A. HARM'.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3323402 *Oct 8, 1965Jun 6, 1967Standard Pressed Steel CoThread forms
US3794092 *Nov 12, 1971Feb 26, 1974Textron IncLocking fastener
US4266590 *Apr 9, 1979May 12, 1981Microdot Inc.Prevailing torque nut
US4334814 *Jul 21, 1980Jun 15, 1982Microdot Inc.Self-tapping screw for use in plastics
US4540321 *Sep 18, 1980Sep 10, 1985Microdot Inc.Anti-vibration thread form
US4594039 *May 11, 1981Jun 10, 1986Microdot Inc.Fastener
US4810149 *Apr 26, 1988Mar 7, 1989Lee Jae BScrew-type fastening device
US4850775 *Apr 26, 1988Jul 25, 1989Lee Jae BScrew-type fastening device
US7465135Nov 14, 2003Dec 16, 2008Maclean-Fogg CompanyU-Nut fastening assembly
US8011866Apr 19, 2007Sep 6, 2011Maclean-Fogg CompanyLocking fastener assembly
U.S. Classification411/309, 411/938
Cooperative ClassificationF16B39/30, Y10S411/938